On November 23, 2018 during the "ANGERME 2018 Aki Denkousekka" concert finale taking place at Pacifico Yokohama, Oota Haruka and Ise Reira were revealed to be new seventh generation members of ANGERME. Their activities with the group would officially begin with the Hello! Project 2019 WINTER concert tour.

On February 28, 2020 it was announced that Oota was placed on indefinite hiatus from all activities by her own request after admitting to breaching Hello! Project rules. The announcement noted that the office takes the matter seriously and would offer guidance from the basics while giving her time to reflect, with her return to activities to be announced at an undetermined date. Oota stated she would take time to learn from her mistake and come back with improved self-awareness and a higher level of professionalism.